Round Rock, TX · PFAS · forever chemicals
Is There PFAS in Round Rock Tap Water?
Round Rock, TX: PFBS 6.7 ng/L detected, below the 2,000 ng/L EPA health advisory, in 2024 testing. Every PFAS result and filter certifications per compound.
The measurements · EPA UCMR 5
4 of 29 PFAS detected
Each result is read against its own reference. None of the detected compounds has a federal limit. PFBA and PFPeA have no federal or state limit and are shown for transparency, not graded.
- PFBSEPA health advisoryPerfluorobutanesulfonic acid6.7ng/LDetected, below its EPA health advisory · sampled 2024-10-23 to 2025-07-14Evidence
- PFHxAState MCL · MichiganPerfluorohexanoic acid3.7ng/LDetected, below its state limit · sampled 2024-10-23 to 2025-07-14Evidence
- PFPeANo limitPerfluoropentanoic acid6.7ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2024-10-23 to 2025-07-14Evidence - PFBANo limitPerfluorobutanoic acid5.1ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2024-10-23 to 2025-07-14Evidence
All 29 compounds in this record
- PFOAMCLNot detected
- PFOSMCLNot detected
- PFHxSMCLNot detected
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFBS6.7 ng/L
- PFHxA3.7 ng/L
- PFBA5.1 ng/L
- PFPeA6.7 ng/L
- 11Cl-PF3OUdSNot detected
- 4:2 FTSNot detected
- 6:2 FTSNot detected
- 8:2 FTSNot detected
- 9Cl-PF3ONSNot detected
- ADONANot detected
- NEtFOSAANot detected
- NFDHANot detected
- NMeFOSAANot detected
- PFDANot detected
- PFDoANot detected
- PFEESANot detected
- PFHpANot detected
- PFHpSNot detected
- PFMBANot detected
- PFMPANot detected
- PFPeSNot detected
- PFTANot detected
- PFTrDANot detected
- PFUnANot detected
MCL marks the 5 PFAS given a federal limit in EPA's 2024 rule. EPA has proposed rescinding three of those limits; they apply until a final rule.
Results as a table29 results with limit, status, sample date and source
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorobutanesulfonic acid (PFBS) | 6.7 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorohexanoic acid (PFHxA) | 3.7 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorobutanoic acid (PFBA) | 5.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoropentanoic acid (PFPeA) | 6.7 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-23 to 2025-07-14 | UCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003) |
How this compares
PFOS across 764 cities with a detected value
4 ng/L federal MCL (2024)
3,396 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 66 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.
Where Round Rock sitsNot on the stripRound Rock’s PFOS result was below the lab’s reporting limit.
What this record covers
- CITY OF ROUND ROCK's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2024-10-23 to 2025-07-14.
What is unknown
- The water at your tap. Building plumbing isn't in this record.
- PFAS not listed in the 29 above were not reported in these records.
- Levels since the last sample have not been published.
Treatment capabilities that apply
Test first, then match a certified method.
A tap test can confirm levels at your home before you choose treatment.
Identified concerns
- PFBS · detected below the limit
- PFHxA · detected below the limit
- PFBA · detected, no federal or state limit
- PFPeA · detected, no federal or state limit
- Reverse osmosisOpen the method →
- Activated carbon (GAC)Open the method →
- Anion exchangeOpen the method →
No product in our catalogue has verified certification for these concerns yet.
Questions
Frequently asked
Follow this water
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Is there PFAS in Round Rock tap water?
In EPA's UCMR 5 testing of CITY OF ROUND ROCK (2024-10-23 to 2025-07-14): PFBA 5.1 ng/L (no federal or state limit), PFBS 6.7 ng/L (EPA health advisory 2,000), PFHxA 3.7 ng/L (state limit 400,000), PFPeA 6.7 ng/L (no federal or state limit) and the other 25 PFAS tested not detected. "Not detected" means below the lab's reporting limit, not proven zero.
What are the federal PFAS limits?
EPA's 2024 drinking-water rule set maximum contaminant levels of 4.0 ng/L for PFOA and for PFOS, and 10 ng/L for PFHxS, PFNA and HFPO-DA (GenX). In May 2026 EPA proposed keeping the PFOA and PFOS limits, with the option of until 2031 to comply, and rescinding the other three. Until a final rule, all five limits apply. Results above them today are above the limits in force.
How do I remove PFAS from my tap water?
Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFOA/PFOS reduction are the proven options at the tap. Check the certifier's listing (NSF, WQA or IAPMO) for the exact model, and replace cartridges on schedule.
- UCMR5 Analytical ResultsUCMR5 Analytical Results: CITY OF ROUND ROCK (TX2460003)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: CITY OF ROUND ROCK (TX2460003)US EPA SDWIS · 2026-07-09View source ↗
- Consumer Confidence Report (CCR)City of Round Rock 2025 Consumer Confidence Report (CCR)City of Round Rock · 2025-01-01View source ↗